A third idea is to explore how Bella's human friends react. Angela and Jessica might be trying to visit her in the hospital, but are kept away by the secrecy of the Cullens. Bella could be longing to share this experience with her human friends, but knows she can't because of the danger it could pose to them and the secrecy of her new family.
One idea could be to focus on Bella's inner thoughts during the birth. Maybe she reflects on her journey from a normal girl to a vampire's mate and how this new life she's bringing into the world will fit into their supernatural existence. For example, she might worry about the baby's safety in a world full of vampires and werewolves.
Another interesting angle could be the reactions of the Cullen family. They could be hovering around, each with their own concerns. Carlisle, as a doctor, would be in charge of the medical aspects, but Esme might be more focused on Bella's emotional state. Alice could be having visions of the future of the baby, which adds an element of mystery to the story.
You can make it unique by changing the setting. Instead of the normal hospital or Cullen house setting, have it in a more remote and magical place, like a hidden glen in the forest that has some special properties that affect the birth. Maybe the magic of the place gives the baby some unique abilities right from birth.
Well, a plot twist might be that the baby has a special connection to an ancient vampire clan that no one knew about. This could lead to a whole new storyline where they try to claim the baby. Also, Bella could experience a vision during the birth that reveals a future event that changes the course of the 'Twilight' world. Maybe she sees a great war coming and this knowledge makes everyone around her change their plans. It could also be that the baby's birth causes some sort of magical ripple effect that starts to change the abilities of other vampires in the area.
A plot could revolve around Simon being a long - lost relative of Bella's. He shows up in Forks and his presence disrupts Bella's relationship with Edward. Simon has his own secrets about the supernatural world which Bella gradually uncovers, and she has to decide between the two different worlds she's now a part of.
Some Bella giving birth fanfiction stories may explore different scenarios. Maybe it's a difficult birth that makes everyone worry about Bella's life. This kind of story often builds a lot of suspense. The author might describe in detail the medical procedures and the efforts of the doctors (if there are any in the fanfiction world) to save both Bella and the baby.
One idea could be to focus on a rare Pokemon giving birth. For example, a shiny Pokemon. You could explore how the trainers and other Pokemon in the area react to this special event. Maybe they gather around to protect the mother during the process.
Another plot idea is that Bella is sent to the Volturi as an emissary from the Cullen family for some reason. During her stay, she gets to know Jane better. Jane initially hates Bella for her association with the Cullens, but Bella manages to show Jane a different side of humanity and vampire - human coexistence. This could lead to a change in Jane's view of the world and a shift in the Volturi's policies towards the Cullens.
Some fanfictions in this theme might focus on the reactions of the Cullen family. They could be either accepting or having some sort of conflict due to Bella's situation with Jacob. Also, the story could explore how Bella herself copes with the physical and emotional changes of being pregnant, especially in a world filled with vampires and werewolves.
A possible plot for the 'Harry Potter and Bella Swan fanfiction' could be that Bella is actually a long - lost relative of a powerful wizarding family in the Harry Potter universe. When she discovers this, she travels to the wizarding world to learn more about her heritage. There, she meets Harry Potter, who is intrigued by her strange abilities. Together, they embark on a journey to uncover the secrets of her family's past and, in the process, they face challenges from those who don't want the secrets revealed. This journey could involve exploring ancient wizarding ruins, deciphering old spells, and facing off against dark forces.
A more complex fanfiction could involve a crossover of the two universes' viruses. The virus in Z Nation and the vampire virus in Twilight somehow interact. Bella, being in the middle of it, has to figure out how to stop a new, more dangerous threat that emerges from the combination of these two 'viruses'.
A plot could revolve around Carlisle and Bella going on a secret mission together. Maybe they have to find a lost ancient vampire artifact that could change the future of the vampire world. Along the way, they develop a deep bond and respect for each other.